Gilroy Roberts designed the obverse of the coin, the letters are his initials.
The animals on the Australian 1 cent coin are the feather tailed glider and on the 2 cent coin the frilled neck lizard.
No known die defects to cause this, regardless I can't see the coin so I suggest you take it to a dealer or collector.
The letters you see on the back of the coin are the monogram of Frank Gasparro he designed the reverse. Gilroy Roberts designed the obverse his monogram is on Kennedy's neck.
They're the initials of John Sinnock, who designed the coin.
he was assasinated
it can be 1c or 2c and it's in Australian coin
It may not have one. 1864 is the year the L was added late in the year. if the coin shows heavy wear it may be hard to see, it's on the lower ribbon behind the neck
Vertebrae
a tie
tie
scarf
tie